KR19990027930A - Intake and exhaust valve structure for internal combustion engine - Google Patents

Abstract

The present invention relates to an intake and exhaust valve structure for an internal combustion engine, and in particular, intake and exhaust ports 31 and 32 connected to the combustion chamber 71 of the cylinder block 70 are formed in the cylinder head 30, but the combustion chamber ( 71 is inserted into the valve hole 80 of the cylinder head 30 so as to be located at the center of the intake and exhaust ports 31 and 32, and is fixed to the bearing cap 81 and rotated by the rotational force of the crankshaft 100. A valve shaft 90 is formed to sequentially open and close the respective intake and exhaust ports 31 and 32 connected to the plurality of combustion chambers 71 according to the stroke, and one end of the valve shaft 90 has a crank shaft 100. The valve gear 91 is formed to be connected to the timing belt 110 that transmits the rotational force of the valve, and a plurality of combustion chambers 71 and suction and exhaust ports 31 and 32 and corresponding positions are formed on the outer circumferential surface of the valve shaft 90. Circular valve cam 92 to maintain the air tightness is formed integrally at a predetermined interval, the The valve shaft rotated by the crankshaft in such a configuration that the inlet 93 is formed on one side of the brake 92 so as to form a passage connecting the combustion chamber 71 and the intake and exhaust valves 31 and 32. In the center of each combustion chamber and each intake and exhaust port, and open and close each intake and exhaust port sequentially according to the stroke of the engine. It is an exceptional invention which can improve and to transfer the power of a crankshaft to a valve for a minute.

Description

Intake and exhaust valve structure for internal combustion engine

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake and exhaust valve structure for an internal combustion engine, and in particular, a valve shaft rotated by a crankshaft is installed so as to be located in the center of a plurality of combustion chambers and respective intake and exhaust ports. By opening and closing in sequence according to the stroke, the structure is simple, reducing the cost and improving the work efficiency in the manufacturing process, and relates to the intake and exhaust valve structure for the internal combustion engine that can transfer the power of the crankshaft to the valve in a minute. .

In general, four-cycle engines have an intake valve and an exhaust valve in one cylinder to draw a mixer necessary for the expansion stroke into the combustion chamber and to discharge the combustion gas to the outside. Therefore, heat resistant steel excellent in corrosion resistance and abrasion resistance is used as a material, and this material is produced by upset forging which does not cut the flow of a metal structure.

As shown in FIG. 1, the intake and exhaust valves may include the valve heads 11 and 21, the valve stems 12 and 22, the valve spring retainer lock grooves 13 and 23, and the valve stem ends 14 and 24. Since the intake valve 10 has a low suction resistance and the exhaust valve 20 has to be turned on for cooling and durability, the materials and sizes of the intake and exhaust valves 10 and 20 are slightly different.

Referring to the conventional installation state of the intake and exhaust valves, the intake and exhaust valves 10 and 20 are inserted into the valve guide 41 of the cylinder block 30 as shown in FIG. And the spring 42 is provided in the outer periphery of the intake and exhaust valve 10, respectively, and the spring retainer lock 43 is fitted in the upper end, and is fixed to the cylinder head 30. As shown in FIG.

Then, the cam shaft 50 is rotatably inserted into one side of the intake and exhaust valves 10 and 20 to be fixed to the cylinder head 30 by the bearing cap 51.

In addition, the rocker arm 60 corresponding to the cam 52 of the cam shaft 50 adapted to the opening and closing times of the intake and exhaust valves 10 and 20 is connected to the cylinder head 10 by a bearing fixing portion 61. Although installed, the rocker arm 60 has one end corresponding to the cam 52 of the cam shaft 50 as well as through the valve clearance adjusting screw 62 installed at the other end of the intake and exhaust valves 10 and 20. This configuration is installed to enjoy the top.

Referring to the operation of the conventional design configured as described above are as follows.

The camshaft 50 rotates by the stroke of the engine. And the rotation of the cam shaft 50 is transmitted to the cam 52 formed in accordance with the opening and closing time of the intake and exhaust valves 10, 20 to rotate the cam 52.

The rotating cam 52 rotates the rocker arm 60 on one side, and the rocker arm 60 sequentially presses upper ends of the plurality of intake valves 10 and the combustion chamber 71 of the cylinder block 70. The intake and exhaust ports 31 and 32 of the connected cylinder head 30 are opened and closed. Therefore, the mixer of the intake port 31 is supplied to the combustion chamber 71, and discharges the exhaust gas of the combustion chamber due to the explosion to the exhaust port 32.

As described above, the conventional intake and exhaust valves are similar in shape and size during the assembling process, so it is not easy for the operator to visually identify them. And to prevent the above problems in terms of quality control, the operator to check the erroneous assembly of the valve, but the inspection itself takes a lot of time, there is a problem that lowers the efficiency of quality control.

In addition, the parts of the camshaft and the lockarm installed to operate the intake and exhaust valves are not easy to manufacture due to their complicated structure, and the camshaft and the rocker arm must be rotated in order to transfer the power of the crankshaft to the valve. Because of this, there is a problem in that the power of the crankshaft cannot be transferred to the valve by a minute due to the intermediate loss of power.

The present invention is to solve the above conventional problems, the inlet and exhaust ports connected to the combustion chamber of the cylinder block is formed in the cylinder head, the valve hole of the cylinder head to be located in the center of the combustion chamber and the suction, exhaust port Inserted into and fixed to the bearing cap and formed by the rotational force of the crankshaft while forming a valve shaft for opening and closing each intake and exhaust port sequentially connected to the plurality of combustion chambers in accordance with the stroke, at one end of the crankshaft The valve gear is formed to be connected to the timing belt that transmits the rotational force of the valve shaft, and a circular valve cam is formed at a predetermined interval at a predetermined interval on the outer circumferential surface of the valve shaft so as to correspond to a plurality of combustion chambers and suction and exhaust ports. A cutout is formed at one side of the valve cam to connect the combustion chamber and the intake and exhaust valves. Is characterized in that the passage is formed.

1 is a front view of a conventional intake and exhaust valve.

Figure 2 is a front sectional view showing an installation state of a conventional intake exhaust valve.

Figure 3 is an exploded perspective view showing the installation of the present invention.

Figures 4a, 4b, 4c, 4d is an enlarged cross-sectional front view showing the main use state of the present invention.

* Explanation of symbols for the main parts of the drawings

30: cylinder head 31: intake port

32: exhaust port 80: valve hole

81: bearing cap 90: valve shaft

91: valve gear 92: valve cam

93 incision

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the description of the present invention, the same or equivalent parts as in the prior art will be described with the same reference numerals.

Figure 3 is an exploded perspective view showing an installation state of the present invention, Figure 4a, 4b, 4c, 4d is an enlarged front sectional view of the main portion showing the use state of the present invention.

First, the configuration of the present invention will be described.

Intake and exhaust ports 31 and 32 respectively connected to the plurality of combustion chambers 71 of the cylinder block 70 are formed in the cylinder head 30, and the intake and exhaust ports 31 and 32 are connected to the combustion chamber 71. The valve hole 80 is formed in the cylinder head 30 so that it may be located in the center of ().

And each of the inlet and exhaust ports 31 and 32 inserted into the valve hole 80 is fixed to the cylinder head 30 through the bearing cap 81, bolted (B) and connected to the plurality of combustion chamber 71 To form a valve shaft 90 to sequentially open and close according to the stroke of the engine, one end of the valve shaft 90 is connected to the timing belt 110 to transmit the rotational force of the crankshaft 100 valve gear 91 ) Is formed.

And the outer circumferential surface of the valve shaft 90 is formed with a plurality of combustion chambers 71 and circular valve cam 92 in a predetermined interval to correspond to the intake, exhaust ports (31, 32) to maintain the air tightly, A cutout 93 is formed on one side of the valve cam 92 to form a passage connecting the combustion chamber 71 and the suction and exhaust ports 31 and 32.

Referring to the operation of the present invention configured as described above are as follows.

The rotational force of the crankshaft 100 is transmitted to the valve gear 91 connected by the timing belt 110 and inserted into the bearing cap 81 on the cylinder head 30, and the valve shaft 90 fixed by the bolt B has a large number. In the center of the combustion chamber 71 and the suction and exhaust ports 31 and 41. In addition, since the valve cam 92 is integrally formed on the outer surface at regular intervals of the valve shaft 90, the valve cam 92 rotates together with the valve shaft 90.

4A, the cutout 93 of the valve cam 92 that rotates during the intake stroke of the engine is positioned between the intake port 31 and the combustion chamber 71. At this time, the valve cam 92 of the valve shaft 90 creates a passage between the intake port 31 and the combustion chamber 71, closes the exhaust port 32 side, and maintains hermetic air. The mixture of air and fuel is introduced into the combustion chamber 71.

4B, the cutout 93 of the valve cam 92 that rotates during the compression stroke of the engine is positioned toward the upper portion of the intake port 31. At this time, the valve cam 92 of the valve shaft 90 closes the intake port 31, the exhaust port 32, and the combustion chamber 71, and maintains the airtight, so that the mixer is compressed in the combustion chamber 71.

As shown in FIG. 4C, the cutout 93 of the valve cam 92 that rotates during the exhaust stroke of the engine is positioned between the exhaust port 32 and the combustion chamber 71. At this time, the valve cam 92 of the valve shaft 90 creates a passage between the exhaust port 32 and the combustion chamber 71, and closes the intake port 31 side and maintains airtight. It is discharged into 32.

As shown in FIG. 4D, the cutout 93 of the valve cam 92 rotating during the explosion stroke of the engine is positioned toward the upper portion of the exhaust port 32. At this time, the valve cam 92 of the valve shaft 90 closes the intake port 31, the exhaust port 32, and the combustion chamber 71, and as a result, the compressed mixer explodes in the combustion chamber 71. Done.

As described above, the present invention installs the valve shaft rotated by the crankshaft to be located at the center of the plurality of combustion chambers and the respective intake and exhaust ports, and opens and closes each intake and exhaust port sequentially according to the stroke of the engine. It is possible to reduce the cost and improve the efficiency of the work in the manufacturing process, it is possible to transfer the power of the crankshaft to the valve by a minute.

Claims (1)

Intake and exhaust ports 31 and 32 connected to the combustion chamber 71 of the cylinder block 70 are formed in the cylinder head 30, and the center and the intake and exhaust ports 31 and 32 of the combustion chamber 71 are formed. Each suction and exhaust port is inserted into the valve hole 80 of the cylinder head 30 and fixed to the bearing cap 81 so as to be positioned and connected to the plurality of combustion chambers 71 while rotating by the rotational force of the crankshaft 100. A valve shaft 90 is formed to sequentially open and close the valves 31 and 32 according to the stroke, and one end of the valve shaft 90 is connected to the timing belt 110 to transmit the rotational force of the crankshaft 100. A gear 91 is formed, and on the outer circumferential surface of the valve shaft 90, a plurality of combustion chambers 71 and circular valve cams 92 that correspond to the intake and exhaust ports 31 and 32 to maintain airtightness are spaced at regular intervals. Is formed integrally with the combustion chamber 71 by forming an incision 93 on one side of the valve cam 92 Intake and exhaust valve structure for an internal combustion engine, characterized in that a passage for connecting the intake and exhaust valves (31, 32) is formed.